Quiz 472 – Practice Paper (Science)

1. In the depression of freezing point experiment, it is found that

  1. Only solvent molecules solidify at the freezing point.
  2. Only solute molecules solidify at the freezing point.
  3. The vapour pressure of the solution is less than that of the pure solvent.

Select the correct answer from the codes given below:

(a) Only 1

(b) Both 1 and 3

(c) Both 2 and 3

(d) All of these.


 

2. Which of the following is correct:

(a) During formation of smog the level of ozone in the atmosphere goes down.

(b) Photochemical smog occurs in days time whereas the classical smog occurs in early morning hours.

(c) Classical smog has an oxidizing character while the photochemical smog is reducing in character.

(d) CO which is major pollutant resulting from the combustion of fuels in automobiles plays a major role in photochemical smog.


 

3. The most extensive, commercially useful sources of thorium as monazite send occurs in India at

(a) West Bengal coast

(b) Travancore coast

(c) Gujarat coast

(d) Orissa coast


 

4. Which one of the following is not correct about boiling and evaporation?

(a) Boiling point decreases if external pressure is low but evaporation increase if external pressure is low.

(b) Boiling can take place in closed as well as open vessel whereas evaporation takes place only in are open vessel.

(c) Evaporation takes place only from the surface whereas boiling involves formation of bubbles blow the surface.

(d) Evaporation takes place at all temperatures whereas boiling takes place only at one particular temperature.


 

5. The water pollutants mainly responsible for eutrophication are

(a) Polychlorinated biphenyls.

(b) Detergents and fertilizers containing phosphate anion.

(c) Heavy metals present in mining waste.

(d) Cd, Pb and Hg present in industrial waste.


 

6. On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because

(a) The cohesion of water is greater than its adhesion with glass.

(b) The cohesion of mercury is greater than its adhesion with glass.

(c) The density of mercury is greater than that of water.

(d) Mercury is a metal.


 

7. Pole Star does not seem to move because

(a) It rotates very rapidly.

(b) Its movement can be seen only during a solar eclipse.

(c) It moves around the sun and not the earth.

(d) It is in line with the earth’s axis of rotation.


 

8. Radiocarbon is produced in the atmosphere as a result of

(a) Lighting discharge in atmosphere.

(b) Action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere.

(c) Action of ultraviolet light from the sun on atmospheric oxygen.

(d) Collision between fast neutrons and nitrogen nuclei present in the atmosphere.


 

9. It is more difficult to walk on a sandy road than on a concrete road because

(a) the sand is grainy but concrete is smooth.

(b) the friction between sand and feet is less than that between concrete and feet.

(c) the friction between sand and feet is less than that between concrete and feet.

(d) sand is soft and concrete is hard.


 

10. A fuse is used in mains electric supply as a safety device. Which one of the following statements about the fuse is correct?

(a) It must have a very high resistance.

(b) It must have a low melting point.

(c) It is made mainly from silver alloys.

(d) It is connected in parallel with the main switch.


 

11. Why an individual gets muscle cramps after heavy exercise?

  1. Because of accumulation of lactic acid.
  2. Cramps occur when muscle cells respire anaerobically.
  3. Because of partial breakdown of glucose.

(a) Only 1

(b) Both 1 and 3

(c) Both 2 and 3

(d) All of these.


 

12. Which of the following ingredients are required for formation of Red Blood Cells?

  1. Vitamins
  2. Fe
  3. Folic Acid

Select the correct answer using the codes given below:

(a) Only 1

(b) Both 1 and 3

(c) Both 2 and 3

(d) All of these.


 

Answers:

  1. (b)
  2. (b)
  3. (b)
  4. (b) Evaporation takes place in a closed vessel also.
  5. (b) Eutrophication involves increase in the concentration of the phosphate ions on the surface of water.
  6. (b)
  7. (d)
  8. (d)
  9. (b)
  10. (b)
  11. (d)
  12. (d)

Also Read:

Quiz 468 – Practice Paper (History)

Quiz 466 – Practice Paper (Science and Tech)

Quiz 464 – Practice Paper (Indian Culture)

Quiz 463 – Practice Paper (Indian Polity)

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